JPH03117798A - Partial mending method for pipe line from inside thereof and mending material used in mending method therefor - Google Patents
Partial mending method for pipe line from inside thereof and mending material used in mending method thereforInfo
- Publication number
- JPH03117798A JPH03117798A JP1252953A JP25295389A JPH03117798A JP H03117798 A JPH03117798 A JP H03117798A JP 1252953 A JP1252953 A JP 1252953A JP 25295389 A JP25295389 A JP 25295389A JP H03117798 A JPH03117798 A JP H03117798A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- repair
- hot melt
- mending
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 19
- 239000012943 hotmelt Substances 0.000 claims abstract description 26
- 239000003677 Sheet moulding compound Substances 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims description 24
- 239000011347 resin Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 14
- 230000007797 corrosion Effects 0.000 abstract description 14
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 239000012768 molten material Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920006337 unsaturated polyester resin Polymers 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Pipe Accessories (AREA)
- Coating Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、地中に埋設されたガス導管、給排水管あるい
はその他の管路をその内面から部分補修する方法とこの
補修材に関する。特に、本発明では、前述のガス導管等
において、その一部に腐食孔等が発生した場合、その部
分の管路の内面に補修材をあてて腐食孔を閉塞するとと
もに、前記補修材の一部を腐食孔に流入し、腐食孔をお
おい、腐食孔が浸食していくのをおさえることを特徴と
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for partially repairing underground gas pipes, water supply and drainage pipes, or other pipes from the inside thereof, and a repair material for the same. In particular, in the present invention, when a corrosion hole or the like occurs in a part of the gas pipe, etc., a repair material is applied to the inner surface of the pipe in that part to close the corrosion hole, and the repair material is removed. It is characterized by flowing into the corrosion hole, covering the corrosion hole, and suppressing the erosion of the corrosion hole.
［従来の技術］
従来、この種のガス導管等において、その一部に腐食が
発生したり、漏洩原因が発生した場合の補修方法として
、管路の内面に柔軟でかつ固形の補修材を圧着し、これ
を接着させて補修する方法が知られているが、この方法
では、接着力が減退したとき、補修材がはがれてしまう
ため、本出願人等は、常温で剛性を有する低融点の熱可
塑性樹脂で作られた補修スリーブを加熱して軟化させ、
拡径することにより補修スリーブを被補修箇所を含む管
内面に密着させて冷却することにより剛性を復元させる
方法（従来側温１の方法）やシートモルディングコンパ
クトで作られた補修シートを端がオーバーラツプするよ
うに円曲せしめて被補修管路内の被補修箇所まで挿入し
１次にこの円曲せしめた補修シートの内面に圧を加えて
拡径させ、被補修箇所を含む管内面に密着させると共に
、この補修シートに熱を加えて硬化させる方法（従来側
温２の方法）を提案した。[Prior Art] Conventionally, as a repair method for this type of gas pipe, etc., when corrosion occurs in a part or a leak occurs, a flexible and solid repair material is crimped onto the inner surface of the pipe. However, in this method, when the adhesive strength decreases, the repair material peels off, so the applicant et al. A repair sleeve made of thermoplastic resin is heated to soften it.
There is a method in which the repair sleeve is brought into close contact with the inner surface of the tube, including the area to be repaired, by enlarging its diameter, and the rigidity is restored by cooling (conventional method of side temperature 1). The repair sheet is bent into an overlapping shape and inserted into the repaired pipe to the repaired point.Firstly, pressure is applied to the inner surface of this curved repair sheet to expand its diameter so that it adheres tightly to the inner surface of the pipe, including the repaired point. At the same time, we proposed a method of curing the repair sheet by applying heat (conventional method of side temperature 2).
［解決しようとする課題］
ここで、上記固形の補修材を管路の内面に圧着し、接着
させる方法では、補修材自身腐食孔を埋めることはでき
ない、−古管内面と補修材の間にある接着剤が流動しう
るが、第４図に示すように、補修材Ｏ１が前記の腐食孔
０３の入口をすぐに閉塞してしまうので、接着剤がほと
んど孔に流入できない。[Problem to be solved] Here, with the method of crimping and adhering the solid repair material to the inner surface of the pipe, the repair material itself cannot fill up the corrosion holes; - between the inner surface of the old pipe and the repair material. Although some adhesive may flow, as shown in FIG. 4, the repair material O1 immediately blocks the entrance of the corrosion hole 03, so that almost no adhesive can flow into the hole.
また、従来側温１の方法で用いられている補修スリーブ
は、常温で剛性を有しているものを、固形の状態を維持
しつつ軟化させて使用するもので、前述の補修材と同様
の作用をもつ。In addition, the repair sleeve used in the conventional method of side temperature 1 is one that is rigid at room temperature and is softened while maintaining a solid state, and is similar to the repair material described above. It has an effect.
これらに対して、従来側温２の方法で使用される補修シ
ートは、液状樹脂に増粘剤を混合したものをガラスマッ
トやクロスに含浸し、増粘させ固形化したもので、液状
樹脂の流動性がコントロールされている。従って、補修
シートの流動性を高めることは、ガラスマットやクロス
から樹脂が分離することになり、補修箇所に剛性の高い
補修層を形成するために補修シートを固形化させている
意味が喪失してしまうという問題がある。On the other hand, the repair sheet used in conventional method 2 is made by impregnating a glass mat or cloth with a liquid resin mixed with a thickener, thickening it, and solidifying it. Liquidity is controlled. Therefore, increasing the fluidity of the repair sheet will cause the resin to separate from the glass mat or cloth, and the purpose of solidifying the repair sheet in order to form a highly rigid repair layer at the repair area will be lost. There is a problem with this.
［課題を解決するための手段］
本発明は上記課題を解決する手段として、次の如き補修
方法とこの補修方法に使用される補修材を提案する。[Means for Solving the Problems] As a means for solving the above problems, the present invention proposes the following repair method and repair material used in this repair method.
（１）シートモルディングコンパウンドより成るシート
材の一面に、液状樹脂層あるいは加熱すると流動性をお
びる樹脂によりホットメルト層を形成した補修シートを
該液状樹脂層あるいはホ１．．トメルト層が外側になる
ように円曲せしめてこれを管内に挿入し、次に管内にお
いて前記補修材を半径方向に拡径して管の内面に密着さ
せ、次にこの補修材に熱を加えて液状樹脂層あるいはホ
ットメルト層の溶融化を図り、この溶融した液状樹脂あ
るいはホットメルトを腐食孔内に侵入させ、続いてシー
ト材の硬化を待つて終了する管路をその内面から補修す
る方法。(1) A repair sheet is formed by forming a liquid resin layer or a hot melt layer of a resin that becomes fluid when heated on one side of a sheet material made of sheet molding compound. ．． The repair material is bent into a circle with the tomelt layer on the outside and inserted into the pipe, and then the repair material is expanded in diameter in the radial direction within the pipe so that it comes into close contact with the inner surface of the pipe, and then heat is applied to the repair material. A method in which the liquid resin layer or hot melt layer is melted, the molten liquid resin or hot melt is introduced into the corroded hole, and then the pipe is repaired from the inner surface after waiting for the sheet material to harden. .
（２）シートモルディングコンパウンドより成るシート
材の一面に、液状樹脂層あるいは加熱すると流動性をお
びる樹脂によりホットメルト層を形成した管路をその内
面から補修する方法に使用される補修材。(2) A repair material used in a method for repairing pipes from the inner surface, in which a liquid resin layer or a hot melt layer of a resin that becomes fluid when heated is formed on one side of a sheet material made of sheet molding compound.
上記補修方法において、補修材を管内に挿入するための
補修装置の構造は特に限定されないが、ヒーター等の加
熱手段を有することは条件である。In the above repair method, the structure of the repair device for inserting the repair material into the pipe is not particularly limited, but the condition is that it has a heating means such as a heater.
次に、補修材を構成するシートモルディングコンパウン
ドは不飽和ポリエステル樹脂等の硬化性樹脂液に酸化マ
グネシウム等の増粘剤とともにスチレン等の架橋剤やそ
の他の配合剤を混合したものが最適である。Next, the best sheet molding compound for the repair material is a mixture of a curable resin liquid such as unsaturated polyester resin, a thickener such as magnesium oxide, a crosslinking agent such as styrene, and other compounding agents. .
一方ホットメルトとしては熱可塑性樹脂を主に１００％
固形の成分より成るもので、エチレンビニルエステル共
重合体のケン化物、更には該ケン化物にカルボキシル基
を導入した共重合体のような優れた溶融流動性を持つも
のが望ましく、ここに示したホットメルトは低融点に特
徴かあり、従来の液状の接着剤に比しても比較的低温で
流動特性を発現させることができる上に、常温でベトッ
キが少なく、扱い易いと共に固化しやすい特徴を持って
いる。なお、ホットメルトのかわりに元来液状のもので
も使用可能である。On the other hand, hot melts are mainly made of 100% thermoplastic resin.
It is preferable to use a solid component with excellent melt fluidity, such as a saponified ethylene vinyl ester copolymer or a copolymer in which a carboxyl group is introduced into the saponified copolymer. Hot melt adhesives are characterized by a low melting point, allowing them to develop fluidity at relatively low temperatures compared to conventional liquid adhesives, and are less sticky at room temperature, making them easier to handle and solidifying. have. Note that instead of hot melt, it is also possible to use a liquid product.
［作用］
補修シートが管の内面に圧着したなら、ヒーターに通電
を行なうと、ヒーターが発熱し、この熱により補修シー
トが加熱されるが、この加熱段階で補修シートは以下の
ように機能する。加熱により補修シートを構成している
ホットメルトが先ず液状になるが、この段階ではまだ加
熱温度が低く、補修シートの他方を構成しているシート
モルディングコンパウンドは、これを構成している硬化
性樹脂の流動性が低く、シートモルディングコンパウン
ドのシートが腐食孔の入口を閉塞する形になり、液状に
なっているホットメルトは腐食孔にはほとんど流入しな
い。しかし、硬化温度に達すると、硬化性樹脂の１を動
性が増し、これと同時に液状のホットメルトが腐食孔に
一気に流入する。−古砂化性樹脂の重合硬化も同時進行
し、その進行は急速に進めることが可能で、硬化性樹脂
の流動性が失なわれ、硬化性樹脂の流入が阻止される。[Function] Once the repair sheet is crimped to the inner surface of the pipe, when the heater is energized, the heater generates heat and this heat heats the repair sheet. During this heating stage, the repair sheet functions as follows. . When heated, the hot melt that makes up the repair sheet first becomes liquid, but at this stage the heating temperature is still low, and the sheet molding compound that makes up the other side of the repair sheet has a hardening property. The fluidity of the resin is low, and the sheet of sheet molding compound blocks the entrance of the corrosion hole, and the liquid hot melt hardly flows into the corrosion hole. However, when the curing temperature is reached, the curable resin becomes more dynamic, and at the same time, the liquid hot melt flows into the corrosion hole all at once. - Polymerization and hardening of the aged resin also progresses at the same time, and the progress can be made rapidly, causing the curable resin to lose its fluidity and prevent the inflow of the curable resin.
［実施例］
第１図は本発明の方法に使用する補修シート（補修材）
の好ましい実施例を示す。この補修シート１は、シート
モルディングコンパウンドよりなるシート材２とこのシ
ート材２の一面に被覆されているホットメルト層３（あ
るいは−面をおおっているシート）からなる、シートモ
ルディングコンパウンドは、不飽和ポリエステル樹脂等
の硬化性樹脂液に酸化マグネシウム等の増粘剤とともに
スチレン等の架橋剤やその他の配合剤を混合したものを
ガラスロービングをカッターで切断し、チョップストラ
ンドにしたものに含浸させてシート化し、一定時間加温
し増粘させ固形化したものを使用している。これは、パ
テ状を有している。[Example] Figure 1 shows a repair sheet (repair material) used in the method of the present invention.
A preferred embodiment is shown below. This repair sheet 1 consists of a sheet material 2 made of sheet molding compound and a hot melt layer 3 coated on one side of this sheet material 2 (or a sheet covering the - side). Glass roving is cut with a cutter and chopped strands are impregnated with a mixture of a curable resin liquid such as unsaturated polyester resin, a thickener such as magnesium oxide, a crosslinking agent such as styrene, and other compounding agents. The product is made into a sheet and heated for a certain period of time to thicken it and solidify it. It has a putty-like appearance.
ホットメルト層３は、熱可塑性樹脂を主に１００％固形
の成分よりなるもので、後述する補修例で示すように、
加熱によって溶融させて液状にして使用している。The hot melt layer 3 is mainly composed of a 100% solid thermoplastic resin, and as shown in the repair example below,
It is melted by heating and used as a liquid.
上述の補修シートを用いて管路をその内面から補修する
には、第２図に示すように補修装置ｌＯの樹脂膜１１の
外側に、ホットメルト層３あるいはホットメルトシート
が外側になるように補修シートｌを巻きつけて管路１２
内に挿入する。補修箇所１３で先の挿入を停止し、先ず
膨張膜４内に注入口１４から流体圧を注入する。膨張！
Ｉｌｌに流体圧がかかると、この膨張１９１１が半径方
向に膨張して補修シートｌを拡径し、やがて補修シート
ｌを管路１２の内面に圧着する。補修シートｌが管路１
２の内面に圧着したなら、ヒーター１５に通電を行う。To repair the pipe from the inside using the above-mentioned repair sheet, as shown in FIG. Wrap the repair sheet l around the pipe 12
Insert inside. The previous insertion is stopped at the repair point 13, and fluid pressure is first injected into the expansion membrane 4 from the injection port 14. expansion!
When fluid pressure is applied to Ill, this expansion 1911 expands in the radial direction, expands the diameter of the repair sheet I, and eventually presses the repair sheet I onto the inner surface of the conduit 12. Repair sheet l is pipe line 1
2, the heater 15 is energized.
この結果、ヒーター１５が発熱し、前記シート材２が硬
化する温度が加えられ、急速に硬化せしめる。この段階
で、先ずホットメルト層３が溶融して液状になるが、ま
だ加熱温度が低く、補修シートｌの他方を構成している
シートモルディングコンパウンドは流動性が低いために
シートモルディングコンパウンドが補修箇所１３を閉塞
する形になり、液状になっているホットメルトは補修箇
所１３には流入しない。そして、更に加熱が進み、シー
トモルディングコンパウンドが硬化温度に達すると、こ
の流動性が増し、同時に液状化したホットメルトが第３
図に示すように補修箇所１３内に流入する。一方、シー
トモルディングコンパウンドの重合硬化も同時進行し、
その進行が急速に進み、やがて流動性が失なわれてシー
トモルディングコンパウンドの流入が止り、補修箇所１
３は埋められる。As a result, the heater 15 generates heat, and a temperature at which the sheet material 2 hardens is applied, causing it to harden rapidly. At this stage, the hot melt layer 3 first melts and becomes liquid, but the heating temperature is still low and the sheet molding compound forming the other side of the repair sheet l has low fluidity. The repaired area 13 is closed, and the liquefied hot melt does not flow into the repaired area 13. As the heating progresses further and the sheet molding compound reaches the curing temperature, its fluidity increases and at the same time the liquefied hot melt melts into the third layer.
As shown in the figure, it flows into the repair area 13. Meanwhile, the polymerization and curing of the sheet molding compound is also progressing at the same time.
The process progresses rapidly, and eventually the fluidity is lost and the sheet molding compound stops flowing, and the repaired area 1
3 is filled in.
［本発明の効果Ｊ
本発明は以上の如き補修方法と補修材を使用することに
より、次の如き効果を期待できる。[Effects of the present invention J] By using the above-described repair method and repair material of the present invention, the following effects can be expected.
ａ、従来の管体の気密を保つという補修層の機能に加え
腐食孔或いは亀裂等の浸食をもおさえることができる。a. In addition to the conventional repair layer's function of keeping the pipe airtight, it can also suppress erosion such as corrosion holes or cracks.
ｂ、補修層の剛性がそこなわれないので、硬化性樹脂の
使用を最小限におさえることができる。b. Since the rigidity of the repair layer is not impaired, the use of curable resin can be kept to a minimum.
Ｃ０補修シートとしてとりあつかうことができ、とりあ
つかいやすく、管路の口径によらず施工できる。It can be used as a C0 repair sheet, is easy to handle, and can be applied regardless of the diameter of the pipe.
第１図は本発明に係る補修シート（補修材）の説明図、
第２図は補修装置を使用した補修方法の説明図、第３図
は補修箇所の説明図、第４図は従来の補修例の説明図で
ある。
ｌ ・・・ 補修シート
２ ・・・ シートモルディングコンパウンドシート材
３ ・・・ ホットメルト層
ｌＯ・・・ 補修装置
ｌ ３
補修箇所
特
許
出
願
人
東京瓦斯株式会社
特
許
出
願
人
芦森工業株式会社
第
図FIG. 1 is an explanatory diagram of a repair sheet (repair material) according to the present invention,
FIG. 2 is an explanatory diagram of a repair method using a repair device, FIG. 3 is an explanatory diagram of a repair location, and FIG. 4 is an explanatory diagram of a conventional repair example. l... Repair sheet 2... Sheet molding compound sheet material 3... Hot melt layer lO... Repair device l 3 Repair area Patent applicant Tokyo Gas Co., Ltd. Patent applicant Ashimori Kogyo Co., Ltd. Figure
Claims (2)
材の一面に、液状樹脂層あるいは加熱すると流動性をお
びる樹脂によりホットメルト層を形成した補修材を該液
状樹脂層あるいはホットメルト層が外側になるように円
曲せしめてこれを管内に挿入し、次に管内において前記
補修材を半径方向に拡径して管の内面に密着させ、次に
この補修材に熱を加えて液状樹脂層あるいはホットメル
ト層の溶融化を図り、この溶融した液状樹脂あるいはホ
ットメルトを腐食孔内に侵入させ、続いてシート材の硬
化を待って終了する管路をその内面から部分補修する方
法。(1) A repair material with a liquid resin layer or a hot melt layer formed from a resin that becomes fluid when heated on one side of the sheet material made of sheet molding compound, with the liquid resin layer or hot melt layer facing outward. The repair material is bent into a circle and inserted into the pipe. Next, the repair material is expanded in diameter in the radial direction within the pipe to make it adhere tightly to the inner surface of the pipe. Next, heat is applied to the repair material to form a liquid resin layer or a hot melt layer. This method involves melting the resin, injecting the molten liquid resin or hot melt into the corroded hole, and then waiting for the sheet material to harden before completing partial repair of the pipe from its inner surface.
材の一面に、液状樹脂層あるいは加熱すると流動性をお
びる樹脂によりホットメルト層を形成した管路をその内
面から部分補修する方法に使用される補修材。(2) A repair material used in a method for partially repairing a pipe from the inner surface, in which a liquid resin layer or a hot melt layer of a resin that becomes fluid when heated is formed on one side of a sheet material made of sheet molding compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1252953A JPH03117798A (en) | 1989-09-28 | 1989-09-28 | Partial mending method for pipe line from inside thereof and mending material used in mending method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1252953A JPH03117798A (en) | 1989-09-28 | 1989-09-28 | Partial mending method for pipe line from inside thereof and mending material used in mending method therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03117798A true JPH03117798A (en) | 1991-05-20 |
Family
ID=17244461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1252953A Pending JPH03117798A (en) | 1989-09-28 | 1989-09-28 | Partial mending method for pipe line from inside thereof and mending material used in mending method therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03117798A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0783381A (en) * | 1993-06-25 | 1995-03-28 | Fumito Hinuma | Pipe inside repair device |
| US5423352A (en) * | 1989-01-12 | 1995-06-13 | Sika Robotics Ag | Remote-controlled insertion of sheathing in inaccessible manifolds and junctions |
| US5725026A (en) * | 1995-11-09 | 1998-03-10 | Link-Pipe, Inc. | Conduit lining system and method of lining a conduit |
| US8357742B2 (en) | 2007-11-13 | 2013-01-22 | Mitsubishi Gas Chemical Company, Inc. | Vibration damping material |
| JP2013036302A (en) * | 2011-08-11 | 2013-02-21 | Fujikura Ltd | Method for repairing pipe |
-
1989
- 1989-09-28 JP JP1252953A patent/JPH03117798A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5423352A (en) * | 1989-01-12 | 1995-06-13 | Sika Robotics Ag | Remote-controlled insertion of sheathing in inaccessible manifolds and junctions |
| JPH0783381A (en) * | 1993-06-25 | 1995-03-28 | Fumito Hinuma | Pipe inside repair device |
| US5725026A (en) * | 1995-11-09 | 1998-03-10 | Link-Pipe, Inc. | Conduit lining system and method of lining a conduit |
| US8357742B2 (en) | 2007-11-13 | 2013-01-22 | Mitsubishi Gas Chemical Company, Inc. | Vibration damping material |
| JP2013036302A (en) * | 2011-08-11 | 2013-02-21 | Fujikura Ltd | Method for repairing pipe |
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